Contrast ratio refers to the difference between the minimum brightness and maximum brightness of a monitor. For example, looking at a monitor with a 1,000:1 contrast ratio, a white image would appear 1,000 times brighter than a black image on a particular monitor.

Contrast is the difference between the lowest and highest level of luminance your monitor can display. The maximum difference a monitor can produce is its contrast ratio. Contrast can be improved by increasing the maximum brightness, lowering the darkest possible black level, or both.

Contrast Ratio is the ratio of the brightest white a monitor can create compared to its darkest black. Contrast is typically expressed as 500:1 for example, this would mean the monitor's white colors are five hundred times brighter than its black colors.